Giving the same keyframe to multiple meshes
I can think of two ways: select all the objects you want to apply the animation to, then select the object whose keyframes you are copying last (to make sure that it is the active selected object) then press Ctrl-L to bring up the Link Menu. From there select &quot;Animation Data&quot;, and all the objects you have selected should now have the same animation applied to them. Please note that if you have keyframed the active object's Location property that all of the selected objects will be moved to the same location as the active object.
If you don't want the other objects to match the location of the active object, but you do want them to &quot;fly in formation&quot; as it were, then select all your objects, again making sure the object whose animation you are copying is last, then press Ctrl-P for Parent, and select &quot;Object (Keep Transform)&quot; from the dropdown menu.